package com.sky.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.result.Result;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import reactor.util.annotation.NonNull;

/**
 * 用户端（小程序）jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    //@Autowired
    private final JwtProperties jwtProperties;

    public JwtTokenUserInterceptor(JwtProperties jwtProperties) {
        this.jwtProperties = jwtProperties;
    }

    /**
     * 校验jwt
     *
     * @param request  请求
     * @param response 响应
     * @param handler  处理器
     * @return Boolean
     */
    public boolean preHandle(@NonNull HttpServletRequest request, @NonNull HttpServletResponse response, @NonNull Object handler) throws Exception {
        // 判断当前拦截到的是 Controller 的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            // 当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());

            log.info("当前用户id：{}", userId); // 获取到员工 Id，并存入 ThreadLocal
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应 401 状态码
            Result<String> result = Result.error("NOT_LOGIN", null);
            String jsonRes = JSONObject.toJSONString(result);
            response.setStatus(401);
            response.getWriter().write(jsonRes);
            return false;
        }
    }
}
